We've yet another attempt from Nicholas Stern to persuade us all that beating climate change would actually be good for the economy. Fortunately we've also got Richard Tol around to tell us what's really going on here:

The original Stern Review argued that it would cost about 1% of global GDP to stabilise the atmospheric concentrations of greenhouse gases around 525ppm CO2e. In its report last year the Intergovernmental Panel on Climate Change (IPCC) put the costs twice as high. The latest Stern report advocates a more stringent target of 450 ppm and finds that achieving this target would accelerate economic growth.

This is implausible. Renewable energy is more expensive than fossil fuels, and their rapid expansion is because they are heavily subsidised rather than because they are commercially attractive. The renewables industry collapsed in countries where subsidies were withdrawn, as in Spain and Portugal. Raising the price of energy does not make people better off and higher taxes, to pay for subsidies, are a drag on the economy.

Just not impressed there is he?

There are some eminently sensible things that could be done, things that would have the effect of reducing climate change into the future. Poor and oil producing nations throw $600 billion a year in subsidies at fossil fuel use for example. Stopping that would be a sensible thing to do: but it would be a sensible thing to do simply because it's a sensible thing to do. The effect on climate change is just an added benefit.

But low-cost climate policy is far from guaranteed – it can also be very, very expensive. Europe has adopted a jumble of regulations that pose real costs for companies and households without doing much to reduce emissions. What is the point of the UK carbon price floor, for instance? Emissions are not affected because they are capped by the EU Emissions Trading Systems, but the price of electricity has gone up.

There's an awful lot of weight resting on that "well-designed" there. In fact, absolutely every report, yea every single one, that has concluded that we'd be better off trying to avert climate change than to go through it has been running the numbers on the politicians using sensible methods of aversion rather than not sensible ones. And yet when we see what those same politicians actually enact on that evidence base they're not sensible policies. Thus the justification they're relying upon doesn't in fact exist.